I've already explained this.
Injuries can be accident. however this is epidemic. if your whole team comes down with food posioning you don't say next man up. you fix your food supply.
the offense has routinely sucked in the 1st half putting the defense on the field. a tired defense leads to players out of position, not squared, etc.
Bad fundementals also leads to players out of position, bad technique, twisted, turned around, etc.
Also failure to substitute when players fatiqued.
You won't see Bama with injuries because all of their players know fundamentals and technigue, whether on offense or defense. if you are attacking and delivering, you are less likey to get hurt than if you are reacting.
they showed a replay of the Bama backer (foster?) who run blitzed and blew up a play for loss because he didn't wait and react but immediately attacked his spot.